Apparatus for use in trimming hollow pediform articles



April 15, 1930. w, DE wrr-r 1,754,818

APPARATUS FOR USE IN TRIMMING HOLLOW PEDIFORM ARTICLES Filed Jan. 30, 1929 125%?07 iaglye.

Patented Apr. 15, 1930 UNITED STATES PATENT oFFic WILLIAM J. DE WITT, OF AUBURN, NEW YORK, ASSIGNOR TO THE SHOE FORM 00., ING., OF AUBURN, NEW YORK, A CORPORATION OF NEW YORK APPARATUS FOR USE IN TRIMMING HOLLOW PEDIFORM ARTICLES Application filed January 30, 1929.

This invention relates to an improvement in a trimming machine, and is here shown as applied to a trimming machine of the type disclosed in my copending application, Serial No. 129,767, filed August 17, 1926, now Patent No. 1,700,197, dated January 29, 1929.

The machine disclosed in that application is particularly adapted for trimming hollow pediform articles, as for example, for trimming the surplus material from the edges of hollow shoe forms such as are usually molced from sheet material as, for instance, celluloid. In the trimming of sheet material, such as celluloid which is softened or tends to become tacky when heated, it has been found that the operation of a high speed r0 tary cutter upon this sheet material is very much improved by supplying lubricant to the surface of the cutter, and one object of this invention is to provide, in such a trimming machine, means by which lubricant, such as oil or similar material, is supplied automatically to the surface of the cutter.

Other objects of the invention will appear from a consideration of the following specification and of the drawings which form a part thereof and in which Fig. 1 is a side elevation, partly in section, of a trimming machine embodying this invention; and

Fig. 2 is a side elevation, to larger scale, of a portion of the cutter shaft.

The particular embodiment herein shown and described was selected solely for the purpose of illustration and not for limitation. This embodiment comprises a machine having a base 1 which is adapted to rest upon, and be secured to, abench or other suitable support 2. Rising from the base 1 is standard 3 which carries an elongate overhanging arm 4. At a point intermediate the ends of the arm 4 depends a bracket 5 which may be integral with the arm as shown in Fig. 1, or may be formed as a separate element and secured to the arm if desired.

Carried by the bracket 5 is an elongate tubular horn 6 substantially parallel to the arm 4, one end of the horn being mounted in a socket 7 provided at the lower end of the bracket 5. Within the horn 6 is formed a Serial No. 336,146.

longitudinally extending bore 8 through which passes a shaft 9. The bore 8 preferably has an enlarged intermediate portion 10 which, as will be pointed out below, acts as a reservoir for lubricant. The ends 11 and 12 0f the bore are substantially of the diameter of the shaft 9, and thus act as supporting bearings therefor. The rear end of the cut ter shaft extends beyond the horn 6 and is supported in the standard 3. The shaft 9 is connected to a pulley 13 which may be driven by a belt from any convenient source of power. It will be understood that the pulley 13 may be replaced by an electric motor or other driving means directly connected to the shaft 9, if desired.

The forward end of the shaft 9 may be fiattened or slabbed off at 1 1 on one or both sides, as more fully shown in my copending application, thus forming a spline by which the cutter disk 15 is rotated. The forward end of the horn 6 is extended beyond the end of the shaft 9 to form a hood 16 in which is provided a slot 17 through which the disk-like cutter 15 may project. Pinned upon the shaft 9 is a collar 18 which is normally forced into engagement with the rear face of the horn 6 by means of a spring (not shown) housed in a bore in standard 3, and thus determines the amount of projection of the end 14 of the shaft beyond the horn 6. The cutter 15 is mounted on the shaft by first retracting the shaftto the left against the action of said spring so as to permit slipping the cutting disk 15 into the slot 17. The shaft is then permitted to return to normal position, being turned by means of the collar 18 until its slabbed off end 15 enters the similarly shaped opening in the disk.

Within a vertical groove at the free end of the overhanging arm 4 is mounted a vertical ly adjustable work support 20 which is held in position by means of a plate 21 secured by screws, or otherwise, to the end face of the arm 1. The upper end of the work support 20 is externally threaded and receives an ad justing nut 22- having a flange 23 which extends below a retaining finger 24 carried by the plate 21, so that the rotation of the nut 22 will raise or lower the work support 20.

The work support 20 is provided at its lower end with a foot 25, preferably wedge-shaped, which tapers outwardly from its attachment to the work support. The upper face 26 of the foot 25 is inclined and acts as a support- I for the-upper part of a shoe in- WlllCh; a shoe form is placed. The lower faceis provided with a boss 27 which is directly opposed to the cutter 15 and which may or may not be 10 provided with a groove 28-to-receive the-edge of the cutter 15.

The shoe having a hollow form therein is placed upon the foot 25, the shoe upper bearing on the face 26, and that portion of the 15 form which projects from the shoe extending between the boss 27 ofthe foot and the cutter 15.

The reservoir 10 in the born 6 may be filled with lubricant such as oil, or other material,

through a channel 30 which passes through the upper wall, of the socket 7 and through the horn 6. The cutter shaft 9 is provided with a spiral groove 31 or its equivalent, the spiral being so arranged that the rotation of e cutter shaft in the usual direction causes the lubricant in the reservoir lOto be carried through the outer bearing 12 to the surface of thecutter disk 15. The lubricant forms a thin: film on the surface of the disk and thus 3" reduces the friction between the disk and the celluloid, so that overheating and softening of the material is prevented. The reservoir will, of course, be kept filled by means of the passage 30, and additional lubricant can be 35 introduced at any time without thenecessity of stopping the operation of the machine.

While the present invention hasbeen illustrated and described with particular reference to the trimming of celluloid shoe forms,

, it is at broader application and its principles may be applied to the trimming of other articles of celluloid or the likeor pediform articles, for example shoes, made of other materials,

1. Apparatus for trimming surplus material from hollow pediform articles made of sheet material comprising a rotary disk cutfor, a shaft upon which the cutter is mounted,

59 means for rotating the cutter shaft, and'means for supplying a lubricating medium along the cutter shaft to the cutter to reduce friction between the cutter and the work.

2. Apparatus for trimming: surplus material from hollow pediform articles made of sheet material comprising a rotary shaft, :1 disk cutter mounted thereon, means for rotating the shaft, and means providing a reservoir for lubricating medium, the shaft havno ing a spirallyextending feed element for conveying lubricating medium from the reservoir to-the cutter;

Signed by me at Auburn, New York, this 26th day of January, 1929.

en WILLIAM J. DE WITT. 

